Abstract
The stable free radicals perchlorodiphenylmethyl, (C6Cl5)2ĊCl, and perchlorotriphenylmethyl, (C6Cl5)3C, have been examined by electron resonance. In solution, the isotropic α-chlorine hyperfine splitting in PDM was found to be 6.08 Mc/sec. Splittings from 13C in natural abundance at the methyl carbon (about 100 Mc/sec) and at additional phenyl–carbon sites were measured for both radicals. By incorporating PDM in the liquid crystal p-azoxyanisole, the principal values of the anisotropic hyperfine coupling tensor of the α chlorine were derived and found to be A11 = − 9.2, A22 = − 18.9, and A33 = 47.2 Mc/sec. The variation with temperature of the degree of ordering of the radicals in the nematic mesophase was determined.
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